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straight rods
Structural details include the major groove-minor groove of the double helix
40N/4Kg Newton Force Meter Spring Scale
Mounted on a pivot in a semi-median
Mechanical Stopwatch straight rodsMechanical Stopwatch. Start Stop Reset Function can be operated by the crown. Manual winding 13 Ruby. Case: chrome plated metal. Measuring range 15 minutes. Resolution: 1 10 second. Diameter: 5 cm. Premium Quality: Mechinal Stopwatch is made of high grade construction all the way through, excellent build quality and proven reliability across the range. Designed for use in professional laboratories but is an ideal choice for science classrooms and
